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It would appear that the left/right touch pad buttons have failed. You will have 3 options at this point in time. 1) Use an external wireless mouse such as a Logitech Wireless Mouse M505 for roughly $39.99 2) Use alternative features on the laptop. Left click is typically simulated by tapping or double tapping the touch pad itself and right click can be simulated, in most cases, by single tapping the icon and pressing the pop-up menu button, typically located between the right alt and ctrl buttons. 3) Search for a replacement component online and replace the component. Touch pad replacement will require you to remove all casing screws from the laptop and then remove the case. You will then expose the screws and cabling for the touch pad. I can not give more detailed instructions as this varies per laptop model.
Try going to Control Panel - Hardware and sound - mouse. Once you have the menu for the mouse open, go to device settings. Click settings, and all of the advanced controls for the functions of your mouse pad can be found there.
Try This.... May work if touch-pad driver is installed correctly....
Go to control panel ---> choose control panel home ---> click hardware & sound ---> click the 'mouse' word(mouse properties will appear) ---> select dell touchpad ----> click on the touchpad diagram( dell touchpad setting will appear) -----> select scrolling option -----> tick enable on the checkbox ----> then click apply and ok.....
[ here, i attached picture aiding you with the step ]
( gud luck )
Tap to click is the feature of the touchpad driver. Uninstall any existing touchpad drivers and then restart the computer.
Go to www.support.dell.com enter the computer service tag and get the drivers for the touchpad from there. Also update the BIOS of your computer to the most recent version. In most cases a part replacement is not needed and the issue should be fixed.
In the touchpad settings (Control Panel, Mouse) see if tap to click is enabled, if so uncheck and see if there is any difference. Also try booting in the safe mode, and see if that changes anything (F8 during boot to access safe mode) If no difference, then you'll likely need a new palmrest to fix the touchpad. If the touchpad works normally in the safe mode, try a new touchpad driver from support.dell.com